I've been fighting an oversupply for my 3 month old too. It's finally evening out, thanks to block feeding. I start and finish on one side, and start on that same side next feeding. Then I switch to the other side once the first feels empty enough and finish! Luckily she isn't too fussy, I just have to burp her a lot to get all the gas out.
I hope it evens out for you soon!
Loving Life as a Coastie Wife
Welcomed Liberty Grace May 12, 2011!